The talk was about migrating Vue.js projects from version 2 to version 3. The speaker outlined the differences between the two versions, and provided guidance on updating components, Vuex, Vue-router, and tests. The speaker recommended checking dependencies to ensure they are compatible with Vue.js 3, and presented a step-by-step approach to migrating to the new version. Overall, the talk offered practical advice for developers who are looking to upgrade their Vue.js projects.